package com.wzn;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
 * Servlet implementation class UploadServlet
 */
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	private static final String UPLOAD_DIRECTORY="upload";
	
	
	private static final int MEMORY_THRESHOLD=1024*1024*3;
	private static final int MAX_FILE_SIZE=1024*1024*40;
	private static final int MAX_REQUEST_SIZE=1024*1024*50;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UploadServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		if(!ServletFileUpload.isMultipartContent(request)){
			PrintWriter writer=response.getWriter();
			writer.println("Error:表彰必须包含 enctype=multipart/form-data");
			writer.flush();
			return ;
		}
		
		DiskFileItemFactory factory=new DiskFileItemFactory();
		factory.setSizeThreshold(MEMORY_THRESHOLD);
		factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
		ServletFileUpload upload =new ServletFileUpload(factory);
		upload.setFileSizeMax(MAX_FILE_SIZE);
		String uploadPath=getServletContext().getRealPath("./")+File.separator+UPLOAD_DIRECTORY;
		File uploadDir=new File(uploadPath);
		if(!uploadDir.exists()){
			uploadDir.mkdirs();
		}
		
		try {

            List<FileItem> formItems = upload.parseRequest(request);
 
            if (formItems != null && formItems.size() > 0) {
                // 迭代表单数据
                for (FileItem item : formItems) {
                    // 处理不在表单中的字段
                    if (!item.isFormField()) {
                        String fileName = new File(item.getName()).getName();
                        String filePath = uploadPath + File.separator + fileName;
                        File storeFile = new File(filePath);
                        // 在控制台输出文件的上传路径
                        System.out.println(filePath);
                        // 保存文件到硬盘
                        item.write(storeFile);
                        request.setAttribute("message",
                            "文件上传成功!");
                    }
                }
            }
		} catch (FileUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			 request.setAttribute("message",
	                    "错误信息: " + e.getMessage());
		}
		
		
		  getServletContext().getRequestDispatcher("/message.jsp").forward(
	                request, response);
		
	}

}
